nonstraight line correlation

例句：

1. 1. The relationshipbetween the two variables is nonstraight line correlation.
   这两个变量之间的关系是非直线相关的。
2. 2. The study found a significant nonstraight line correlation between income and happiness.
   研究发现收入与幸福感之间存在显著的非直线相关关系。
3. 3. The data showed astrong nonstraight line correlation betweentemperature and precipitation.
   数据显示温度和降水之间存在强烈的非直线相关关系。